Adding ability to change Common Clang's library name: fix for debug build

Change-Id: I68c97de09beb1e1d4aa2bde7235b2e915552092a

Author: PawelJurek

cclang/CMakeLists.txt

@@ -111,7 +111,7 @@ endif (WIN32)
 
 # set that name of the main output file as a target name
 if (NOT DEFINED COMMON_CLANG_LIBRARY_NAME)
-    message(FATAL_ERROR "COMMON_CLANG_LIBRARY_NAME not set!")
+    set(COMMON_CLANG_LIBRARY_NAME common_clang)
 endif()
 set(TARGET_NAME ${COMMON_CLANG_LIBRARY_NAME}${BUILD_PLATFORM} )